Almost everything that makes you feel "happy" is linked to one of the four happiness hormones: dopamine, serotonin, endorphin and oxytocin. Here are some ways you can boost them.

There are some not-so-healthy habits that increase dopamine -- like drinking caffeine, eating sugar or taking certain recreational drugs.

Confidence triggers serotonin. Monkeys try to one-up each other because it stimulates their serotonin. People often do the same

You can boost oxytocin by being physically intimate with others. But besides the physical aspect, it's important to know that there's an emotional connection to how oxytocin is released.

Laughter is one way to boost endorphins naturally -- so is eating dark chocolate, watching your favorite drama on Netflix, working out and meditating.